What might be the way to get these things re-addressed, and what tone would be the way to approach that with?
I think the simplest way would be to submit a motion to the next BC committee meeting asking what has happened to each project, why it has stalled, what plans there might be to complete it and what the completion timetable is.
Failing that, an explanation of why it has been abandoned despite being approved by the majority of owners.
In other words, put the cat among the pigeons and see where the feathers fall.